DSS optical images of all the SFRs listed in Table 1. Solid-black curves denotes circular boundaries of these SFRs, as parameterized by the "Radius" column of Table 1. Blue and purple circles represent YSOs from Marton et al. (2016) and Dunham et al. (2015) catalogues, respectively. Red and yellow open diamonds represent RNe from Magakian (2003) and Connelley et al. (2007) catalogues, respectively. Dashed-black curve in Chamaeleon’s map denote a circle with radius of 20°.